add cortex-v7a support
How To Run:
see TencentOS-tiny\board\ALPHA_I.MX_emmc_256ddr\README.md
TODO Next:
1. VFP support
2. fault diagnosis support
3. qemu vexpress ca9 support
4. raspberry pi support
5. SMP support
This commit is contained in:
daishengdong
160
board/ALPHA_I.MX_emmc_256ddr/bsp/backlight/bsp_backlight.c
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160
board/ALPHA_I.MX_emmc_256ddr/bsp/backlight/bsp_backlight.c
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/***************************************************************
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Copyright © zuozhongkai Co., Ltd. 1998-2019. All rights reserved.
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文件名 : bsp_backlight.c
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作者 : 左忠凯
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版本 : V1.0
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描述 : LCD背光PWM驱动文件。
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其他 : 无
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论坛 : www.openedv.com
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日志 : 初版V1.0 2019/1/22 左忠凯创建
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***************************************************************/
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#include "bsp_backlight.h"
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#include "bsp_int.h"
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#include "printf.h"
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/* 背光设备 */
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struct backlight_dev_struc backlight_dev;
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/*
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* @description : pwm1中断处理函数
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* @param : 无
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* @return : 无
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*/
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void pwm1_irqhandler(void)
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{
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if(PWM1->PWMSR & (1 << 3)) /* FIFO为空中断 */
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{
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/* 将占空比信息写入到FIFO中,其实就是设置占空比 */
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pwm1_setduty(backlight_dev.pwm_duty);
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PWM1->PWMSR |= (1 << 3); /* 写1清除中断标志位 */
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}
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}
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/*
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* @description : 初始化背光PWM
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* @param : 无
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* @return : 无
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*/
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void backlight_init(void)
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{
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unsigned char i = 0;
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/* 1、背光PWM IO初始化 */
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IOMUXC_SetPinMux(IOMUXC_GPIO1_IO08_PWM1_OUT, 0); /* 复用为PWM1_OUT */
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/* 配置PWM IO属性
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*bit 16:0 HYS关闭
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*bit [15:14]: 10 100K上拉
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*bit [13]: 1 pull功能
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*bit [12]: 1 pull/keeper使能
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*bit [11]: 0 关闭开路输出
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*bit [7:6]: 10 速度100Mhz
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*bit [5:3]: 010 驱动能力为R0/2
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*bit [0]: 0 低转换率
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*/
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IOMUXC_SetPinConfig(IOMUXC_GPIO1_IO08_PWM1_OUT, 0XB090);
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/* 2、初始化PWM1 */
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/*
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* 初始化寄存器PWMCR
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* bit[27:26] : 01 当FIFO中空余位置大于等于2的时候FIFO空标志值位
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* bit[25] :
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0 停止模式下PWM不工作
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* bit[24] : 0 休眠模式下PWM不工作
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* bit[23] : 0 等待模式下PWM不工作
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* bit[22] : 0 调试模式下PWM不工作
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* bit[21] : 0 关闭字节交换
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* bit[20] : 0 关闭半字数据交换
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* bit[19:18] : 00 PWM输出引脚在计数器重新计数的时候输出高电平
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* 在计数器计数值达到比较值以后输出低电平
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* bit[17:16] : 01 PWM时钟源选择IPG CLK = 66MHz
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* bit[15:4] : 65 分频系数为65+1=66，PWM时钟源 = 66MHZ/66=1MHz
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* bit[3] : 0 PWM不复位
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* bit[2:1] : 00 FIFO中的sample数据每个只能使用一次。
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* bit[0] : 0 先关闭PWM，后面再使能
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*/
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PWM1->PWMCR = 0; /* 寄存器先清零 */
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PWM1->PWMCR |= (1 << 26) | (1 << 16) | (65 << 4);
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/* 设置PWM周期为1000,那么PWM频率就是1M/1000 = 1KHz。 */
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pwm1_setperiod_value(1000);
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/* 设置占空比，默认50%占空比 ,写四次是因为有4个FIFO */
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backlight_dev.pwm_duty = 50;
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for(i = 0; i < 4; i++)
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{
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pwm1_setduty(backlight_dev.pwm_duty);
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}
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/* 使能FIFO空中断，设置寄存器PWMIR寄存器的bit0为1 */
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PWM1->PWMIR |= 1 << 0;
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system_register_irqhandler(PWM1_IRQn, (system_irq_handler_t)pwm1_irqhandler, NULL); /* 注册中断服务函数 */
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GIC_EnableIRQ(PWM1_IRQn); /* 使能GIC中对应的中断 */
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PWM1->PWMSR = 0; /* PWM中断状态寄存器清零 */
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pwm1_enable(); /* 使能PWM1 */
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}
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/*
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* @description : 使能PWM
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* @param : 无
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* @return : 无
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*/
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void pwm1_enable(void)
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{
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PWM1->PWMCR |= 1 << 0;
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}
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/*
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* @description : 设置Sample寄存器，Sample数据会写入到FIFO中，
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* 所谓的Sample寄存器，就相当于比较寄存器，假如PWMCR中的POUTC
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* 设置为00的时候。当PWM计数器中的计数值小于Sample的时候
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* 就会输出高电平，当PWM计数器值大于Sample的时候输出底电平,
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* 因此可以通过设置Sample寄存器来设置占空比
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* @param - value : 寄存器值，范围0~0XFFFF
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* @return : 无
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*/
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void pwm1_setsample_value(unsigned int value)
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{
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PWM1->PWMSAR = (value & 0XFFFF);
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}
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/*
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* @description : 设置PWM周期，就是设置寄存器PWMPR，PWM周期公式如下
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* PWM_FRE = PWM_CLK / (PERIOD + 2)， 比如当前PWM_CLK=1MHz
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* 要产生1KHz的PWM，那么PERIOD = 1000000/1K - 2 = 998
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* @param - value : 周期值，范围0~0XFFFF
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* @return : 无
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*/
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void pwm1_setperiod_value(unsigned int value)
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{
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unsigned int regvalue = 0;
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if(value < 2)
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regvalue = 2;
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else
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regvalue = value - 2;
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PWM1->PWMPR = (regvalue & 0XFFFF);
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}
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/*
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* @description : 设置PWM占空比
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* @param - value : 占空比0~100，对应0%~100%
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* @return : 无
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*/
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void pwm1_setduty(unsigned char duty)
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{
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unsigned short preiod;
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unsigned short sample;
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backlight_dev.pwm_duty = duty;
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preiod = PWM1->PWMPR + 2;
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sample = preiod * backlight_dev.pwm_duty / 100;
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pwm1_setsample_value(sample);
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}
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30
board/ALPHA_I.MX_emmc_256ddr/bsp/backlight/bsp_backlight.h
Normal file
30
board/ALPHA_I.MX_emmc_256ddr/bsp/backlight/bsp_backlight.h
Normal file
@@ -0,0 +1,30 @@
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#ifndef _BACKLIGHT_H
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#define _BACKLIGHT_H
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/***************************************************************
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Copyright © zuozhongkai Co., Ltd. 1998-2019. All rights reserved.
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文件名 : bsp_backlight.c
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作者 : 左忠凯
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版本 : V1.0
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描述 : LCD背光PWM驱动头文件。
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其他 : 无
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论坛 : www.openedv.com
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日志 : 初版V1.0 2019/1/22 左忠凯创建
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***************************************************************/
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#include "bsp.h"
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/* 背光PWM结构体 */
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struct backlight_dev_struc
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{
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unsigned char pwm_duty; /* 占空比 */
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};
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/* 函数声明 */
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void backlight_init(void);
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void pwm1_enable(void);
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void pwm1_setsample_value(unsigned int value);
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void pwm1_setperiod_value(unsigned int value);
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void pwm1_setduty(unsigned char duty);
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void pwm1_irqhandler(void);
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#endif
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